Well completion apparatus



Sept. 20, 1966 R. w. DER MOTT WELL COMPLETION APPARATUS 5 Sheets-Sheet 1Filed July 25, 1962 Roy/7700a l V. flew/'70 fl INVENTOR.

ATTGF/VEV Sept. 20, 1966 R. w. DER MOTT 3,273,645

WELL COMPLETION APPARATUS Filed July 23, 1962 5 Sheets-Sheet 2 ANCHORINVENTOR.

07 BY a 2 24 ATTORNEY Sept. 20, 1966 R. w. DER MOTT WELL COMPLETIONAPPARATUS 5 Sheets-Sheet 3 Filed July 23, 1962 i y Q a w r f \I B 4 fifi Fay/7700 0 VV. flex M0 f2 INVENTOR.

ATTORNEY United States Patent 3,273,645 WELL COMPLETION APPARATUSRaymond. W. Der Mott, Houston, Tex., assignor to Schlumberger WellSurveying Corporation, Houston, Tex., a corporation of Texas Filed July23, 1962, Ser. No. 211,525 14 Claims. (Cl. 166-551) This inventionrelates to well completion apparatus, and more particularly, to multiplewell completion apparatus useful in completing one pipe stringindependently of other pipe strings in a well bore.

In multiple well completion a plurality of tubing or casing stringsgenerally extend to different formations at different depths in a wellbore, the pipe strings often times being cemented in the well bore. Itis desired to place only one pipe string in fluid communication with aselected formation of interest by means of a selectively orientedperforating device so that independent production of hydrocarbon fluidsis obtained through the separate tubing strings. It is easilyappreciated that a primary requirement of this completion technique isthe proper orientation and firing of a perforating apparatus to completeonly one pipe string independently of the remaining pipe strings.Mechanical devices heretofore used for orienting of the perforatingapparatus have worked successfully but occasionally present someoperating difiiculties and thus fail to provide the well owners withcomplete confidence that the operation can be successfully conducted.

Accordingly, it is an object of the present invention to rovide new andimproved orienting apparatus adapted for use in multiple completionshaving an increased reliability of operation.

A further object of the present invention is to provide new and improvedorienting apparatus for well perforating arranged for attachment to atubing string and for positively orienting the direction of firing whilethe sup porting cable remains stationary.

A still further object of the present invention is to provide new andimproved orienting apparatus for well perforating wherein a plurality ofelectrical circuits are utilized for gun orienting and firing purposeswhile maintaining complete operating safety.

These and other objects are obtained in accordance with the invention byapparatus including hydraulically actuated anchor means for anchoring toa pipe string and motor driven rotating means for rotating a perforatingdevice relative to the anchor means. The device is arranged so that thehydraulic anchor means first securely attaches to the pipe string andthen a motor (in the rotating means) is actuated. If at any time theanchor fails, the motor will discontinue rotation. Means are alsoprovided to isolate the firing circuit conductor for the perforatingdevice from other electrical conductors so that should a conductor inthe firing circuit become damaged, any false firing current resultingfrom current in adjacent electrical conductors would pass to groundrather than cause accidental operation of the perforating device.

The novel features of the present invention are set forth withparticularity in the appended claims. The present invention, both as toits organization and manner of operation together with further objectsand advantages thereof, may best be understood by way of illustrationand example of certain embodiments when taken in conjunction with theaccompanying drawings in which:

FIG. 1 is a view of apparatus embodying the present invention;

FIG. 2 is a view in cross-section through a borehole in which tubingstrings are cemented and illustrates schematically, the tool anchored ina tubing string;

FIG. 3 is part schematic and part detailed view of the 3,273,645Patented Sept. 20, 1966 'ice combined hydraulic anchor and motoroperating system;

FIG. 4 is a diagram of the electrical circuitry for operating theapparatus;

FIG. 5 is a perspective view of a part of the apparatus; and

FIGS. 6A and 6B are cross-sectional views taken along the length of thehydraulic anchoring section showing in detail the construction andorganization of the hydraulic anchoring section.

Referring now to FIG. 1, a tool assembly is illustrated which iscomprised of a perforator section 10, a radioactivity orienting section11, a rotator section 12 and anchor section 13, and connected at the topof the anchor section 13, a casing collar locator 14. It will be notedthat the tool assembly is jointed along its length to provide shortarticulated lengths tiltable relative to one another to permit passagethrough tortuously disposed tubing or casing strings. While a jointedtool is preferable because it will operate under most any and all pipestring conditions, the tool could be made in an integral assembly inaccordance with the principles hereinafter described.

The entire tool assembly is, of course, sized to be passed through asmall diameter pipe string by means of a support cable 15 spooled on asurface located winch (not shown), the tool assembly being located atany specific depth in a well-known manner.

Perforator 10 may be provided with shaped charges 16 preferably alignedin a vertical array to fire in a single lateral direction away from thecentral axis of the tool assembly. Radioactive orienting section 11includes a radioactive source 17, such as cesium-137 or other low energygamma-emitter, and a suitably spaced radioactivity detector 18, both ofwhich are collimated by radioactive shielding material provided withsuitable rectangular shaped openings arranged to face in a lateraldirection aligned or oriented in a prescribed manner with respect to thedirection of fire of the perforating apparatus. Also contained in thesection 11 are the electrical components necessary to transmit theresponse of the radioactivity detector to the surface. The type ofradioactivity system used may, for example, be a type well known in theart.

Rotator section 12 contains a driving mechanismv to simultaneouslyrotate the interconnected radioactivity section 11 and a perforator 10relative to the anchor section .13. Anchor section 13 has anchor pads 19spaced about its circumference (shown in FIG. 2) the anchor pads beingadapted to be urged outwardly into firm attachment with the tubingstring through suitable openings 20 in the section 13.

Reference is now to FIG. 3 where the anchor section 13 is schematicallyillustrated and details of rotator sec tion 12 are disclosed. Anchorsection 13 includes. a support or housing with an upper fluid reservoirchamber 21 containing a fluid, the reservoir 21 also containing a pumpmotor 22, a motor driven pump 23, a flow control valve 24 and a pressureoperated switch means 25, all of which are suitably attached to thesupport. Pump 23 is driven by a shaft 26 from the motor 22 and also hasan inlet 27 to the reservoir fluid and an outlet 28 connected to thevalve 24. Valve 24 in one position connects the pump outlet 28 to aconduit 29. In another position of the valve 24, the conduit 29 isconnected to a discharge outlet 30 opening to the reservoir fluid.

Pressure responsive switch means 25 includes a microswitch 31operatively connected to a piston 32 in a cylinder 33, the piston 32being urged downwardly under the influence of the spring 34 to hold themicroswitch 31 in one position. Cylinder 33 opens to the reservoir fluidon the side of the piston upon which the spring 34 bears while the otherend of the cylinder 33 is connected by a conduit 35 to the conduit 29.

Below fluid reservoir chamber 21, the support of the housing section 13has a central tubular portion 36 which extends downwardly to a lowerconnecting end 37 received in the upper end of rotator section 12. Anupper portion of the tubular section 36 and depending tubular portion ofthe support form an annular pressure cylinder 38 which opens to conduit29 and in which an annular piston 39 is slidably received. Piston 39 hasa tubular extension 40 slidably received over the central tubular member36 and toggle 'bars 41 respectively attach one end of the anchor pads 19to the piston extension 40. Piston 39 is resiliently urged toward itsuppermost position in the annular cylinder 38 by means of a spring 42about the central tubular member 36. The lower end of the anchor pads 19are respectively connected by toggle members 43 to central tubularmember 36.

The anchor section above described will hereinafter be more fullyexplained in connection with FIGS. 6A and 6B.

The lower connecting end 37 of housing section 13 has a sphericallyshaped portion 44 received in a spherically shaped seat 45 in rotatorsection 12, and a locking nut 46 is provided to hold spherically shapedportions together. Hence, the ball type joint described permits freetilting movement of the housing section 13 relative to section 12. Toprevent relative rotation between the housing sections 13 and 12, alocking pin 47 is provided which extends into a lengthwise elongatedslot in spherically shaped portion 44, the pin 47 being sized to thewidth of the slot and located on the central axis of rotation for thespherical section so as not to impede the relative tilting movement. Atubular connecting member 48 extends between a conduit 49 in the centraltubular section 36 and a reservoir chamber 48a in the motor orientorsect-ion. The tubular member 48 and conduit 49 open to the reservoir 21in the housing section 13, and to the reservoir 48a in the housingsection 12.

In the reservoir chamber 48a, a motor 50 is connected by a coupling 51to a 'gear train 52, the gear train 52 being connected by a clutch 53 toa drive housing 54. The motor 50 and gear train are suitably supportedin the section 12. Drive housing 54 is actually the upper part oforienting section 11 and is supported in the rotator section 12 :bybearings 55, 56, 57 and 58.

Drive housing 54 has a cylindrical bore 54a therein in which a coaxialconductor assembly 59 is received. The coaxial assembly 59 includes acentral electrical conductor 60, a grounded coaxial electrical conductorshield 61, and a second coaxial conduct-or 62, each of the conductorsbeing separated from one another by electrical insulation material andthe outer, second coaxial conductor 62 being electrically isolated fromthe housing and secured thereto by an electrical insulation and bondingmaterial such as an epoxy resin. At the upper and lower ends of thecoaxial assembly 59, portions of the coaxial conductor are peeled awayso that separate electrical inputs and outputs can be connected to eachconductor. At the upper end of coaxial assembly 59, three conductor rods63-65 are respectively disposed perpendicular to .the assembly 59 andused to connect the respective conductors 69-62 to a collector ring 66.The conductor rods 63-65 are suitably electrically insulated andattached to the housing 54. An electrical distribution ring 66 isprovided in the section 12 and contains three longitudinally spacedannular conductive elements 67-69 which -are electrically insulated fromone another and supported in a non-conductive material forming the ring66. The

individual conductive ring elements 67-69 are connected to individualconductor wires (schematically shown).

1 72 which is suitably supported in the housing section 12 on anelectrically insulated body 73. The collector ring 72 (shown in enlargedview in FIG. 5) is provided with peripherally spaced narrow width slots73a, preferably angularly spaced at 10 degrees relative to one anotherto form fingers 74 depending from a common ring 75. One such a slot 73bhas a greater width than the other slots forming a finger 7411 with asmaller width so that a reference point is provided on the ring 72. Thespring contactor member 71 thus makes electrical contact with theindividual depending fingers 74 of the collector ring 72 and the slots73a therebetween break electrical contact as the spring moves from onefinger to another. Ring 72 is connected in an electrical indicatingcircuit as will hereafter be explained.

In the general operation of the above-described apparatus, the assembledtool shown in FIG. 1 is lowered into a tubing string (as shown in FIG.2) to a depth at which perforations are desired. While going through thetubing to the selected depth, the casing collar locator 14 providesindications when the tool passes collars so that the depth location ofthe tool is accurately determined. When the tool is at the selecteddepth for operation, the motor 22 is actuated (from a surface controlnot shown) and the valve 24 is set to connect the pump 23 to the conduit29. Pump 23 Withdraws fluid from the reservoir chamber 21 via inlet 27and supplies fluid under pressure to pressure cylinder 38 via conduit29. Piston 39 is moved by the fluid pressure in cylinder 38 to extendthe pads 19 into engaging contact with the tubing wall. At this time,pressure of the fluid increases and switch 31 is actuated. As willhereinafter be made apparent, switch 31 when actuated conditions motor50 for operation and causes motor 22 to stop operation. Motor 50 inoperation rotates the radioactivity orienting section 11 and perforator10 in unis-on.

Preferred details of the present invention as well as more specificoperation-a1 characteristics will now be more fully explained.

Referring now to FIG. 4, the electrical system for the apparatus isillustrated. The conductors required to translate signals and powerbetween the earths surface and the tool are a ground wire 75, a wire 76for translating current to the hydraulic actuator motor 22 and rotator'motor 50, a wire 77 for translating electrical signals and power fromand to the radioactivity section and a wire 78 for translating currentto the perforator. A three Wire cable where the armor wire is used for aground return is suitable for providing the required conductors.

The wire 78 that connects to the perforator has reversely connecteddiodes 79 to isolate the perforator circuit from stray currents whichmay be induced in the wire above the diodes. Above the diodes, thecasing collar vfor obtaining the indications of easing collars or asource of power for operating the perforator.

The wire 76 can be connected at the earths surfiace by a switch (notshown) to a source of DC. power (not shown). When the surface switch isproperly connected, direct current (position potential) is passedthrough a diode to cause operation of a conventional pulse generator 83,the pulse generator 83 producing spaced electrical pulse outputs. Theoutput of the pulse generator 83 is connected via microswitch 31 to acoil of a solenoid which operates motor 22 (such as a Ledex solenoidmotor hereinafter explained more fully). Pulse generator 83 is alsoconnected via the microswitch and a diode 83a to a coil of a solenoidswitch 84 (hereinafter more fully explained) which actuates the pumpvalve 24. Pump valve 24 when so actuated connects pump outlet 28 toconduit 29. The wire 76 is also connected via a resistance 84a to thesolenoid 84. The solenoid 84 requires the larger current output of thepulse generator 83 for actuation and a far lesser current supplied bythe dire-ct connection through resistance 84a to maintain the solenoidin an actuated condition. The current required to maintain the solenoid84 actuated is less than the current required to actuate the pulsegenerator 83. The output of the pulse generator supplied to the pumpsolenoid 85 is monitored by a resistance-diode combination 83b connectedbetween the coil of the solenoid 85 and the wire 77 which will hereafterbe more fully explained.

Motor 22, as described heretofore, drives the pump 23 to provide a fluidunder pressure via conduit 29 to move the annular piston 39 and therebymove the anchor pads 19 into engagement with the wall of the borehole.The pump 23 will continue operation until the pressure of the fluid inconduit 29 and 35 builds up sufficiently to actuate the pressureresponsive switch means 25 thereby actuating micro-switch 31.Microswitch 31, when actuated, disconnects the pump motor solenoid 85from pulse 'gentrator 83 and connects the pulse generator 83 to a coil86 of a solenoid motor in motor 50 (hereinafter more fully explained) inthe rotation section which rotates the sections 11 and relative to theattached anchor section. Motor 50 like motor 22 is preferably a Ledexsolenoid motor. Other diodes (not numbered) are suitably providedthroughout the circuitry for electrical protection purposes.

Also, in the indexing section, the rotation of the housing 54 causes thespring contactor member 71 to sequentially engage the fingers 74 and theslots 73a breaking the circuit, the fingers, slots, and contactor membertherefore providing a switch means. The contaotor member 71 is connectedto the housing section at electrical ground potential while theconductor ring 72 (FIG. 5) is connected via resistor 87 to the wire 77.Each time the spring contactor 71 passes a slot 73a between theco-ntactor fingers 74, an electrical indication is produced which isdetected at the earths surface. These indication signals consist of DC.pulse type voltage signals which are readily distinguishable from theelectrical signals generated by the radioactivity orientor section. Theenlarged slot 73b and narrower finger 74a provide an electricalreference signal easily distinguishable from the remaining indicationsignals.

In the radioactivity orientor section 11, a detector tube 88, such as ascintillation counter is connected via an amplifier 89 to the wire 77while a voltage supply 89a, provided to operate the amplifier anddetector tube, is also supplied power from the surface via wire 77 Theuse of a single Wire such as Wire 77 to provide downhole power and passdistinct signals up to the surface is well known in the art. Likewise,the surface equipment used in connection with wire 77 to record theradioactivity indications and the switch 71 indications is well known inthe art.

It will be appreciated that the foregoing description concerns theoperation of a valve and pump simultaneously and the pump and motorsequentially from a single wire with a ground return. A D.C. powersupply is connected to a single conductor and the valve, motor and pumpare all D.C. responsive. This unique system reduces the number of cableconductors required and, hence, cable costs. However, it will beappreciated that a multiconductor cable containing six or moreconductors could be used and other than D.C. operated equipment could beemployed. However this is not particularly preferable.

Wires 7678 are passed through the apparatus in a normal fashion and theapparatus housing provides an electrical ground. In the lower part ofFIG. 3, however, the electrical connections are arranged in a novelmanner for insuring safety of operation. With reference to FIG. 3, wire78 is connected to the central conductor 60. The first coaxial conductor61 is connected to an electrical ground and the outer coaxial conductor62 is connected to the radioactivity conductor wire 77. It will beappreciated that the coaxial assembly is such that the firing wire 60 isseparated from the radioactivity wire 77 by an electrical ground wire.Hence, protection against accidental electrical connection between thecurrent in the radiocativity conductor 62 and the firing conductor 60 inthe rotation section is prevented since the electrical ground conductor61 prevents such a direct connection. Hence, the firing line iselectrically isolated from the radioactivity line in the rotatorsection.

Before turning to the details of apparatus illustrated in FIGS. 6A and6B, the detailed operation of the electrical system will be outlined.When the assembled tool as shown in FIG. 1 is positioned in a tubingstring (as shown in FIG. 2) to a depth at which perforations aredesired, the surface control switch (not shown) is operated to connectthe DC. power supply to wire 76 and provide suflicient current toactuate pulse generator 83, the pulse generator producing a pulse outputto microswitch 31. In the position of microswitch 31 shown, the pulseoutput is applied via a diode 83a to actuate the solenoid 84, thesolenoid 84 being held actuated by current passed via Wire 76 throughresistance 84a. The pulse output of the pulse generator 83 also actuatesthe solenoid each time a pulse is applied to it. The pulse output frompulse gen-- erator 83 is also conveyed via a resistor-diode combination83b to wire 77 and at the surface of the earth this indication isindicated on suitable instruments, such as a neon bulb. The purpose ofobtaining this indication is to determine that the pump is beingoperated in the well bore.

The pump 23 provides a fluid under pressure to the pressure cylinder 38and piston 39 to move piston 39 downwardly against the action of spring42 and urge the anchor pads 19 outwardly into engagement with the tubingwall. As the pads 19 engage the wall the fluid pressure builds up and inso doing actuates the pressure responsive means 25 by moving the piston32 and moving switch 31 to its other position. Switch 31, when switched,connects the pulse generator 83 directly to the solenoid 86 of the motor50 for the orientor and disconnects the pump motor 22 from operation.The valve solenoid 84 is, however, kept actuated by the holding currentconveyed via resistance 84a which is prevented from reaching pumpsolenoid 85 by means of diode 83a. The resistor-diode combination 83b isdisconnected from the wire 77.

The motor solenoid 86 when actuated by each pulse operates to rotate theradioactivity section 11 and perforating section 10 relative to theanchored section. In the radioactivity section 11, the source 17 emitsgamma rays and gamma ray detections are made by the tube 88 in detector18 in a lateral direction. Hence, during a full circular sweep about thetubing, the gamma ray indications will decisively alter at the pointswhere the lateral gamma ray devices are directed toward the adjacenttubing string. A plot of the gamma ray measurements taken illustratesvery clearly the alteration in the detected gamma ray intensity causedby virtue of the presence of the adjacent pipe. The precise readings ofthe radioactivity detections .are correlated relative to the tubingstring position(s) by virtue of the indications produced simultaneouslytherewith by the opening and closing of switch 71 at 10 degree angularintervals. The irregular slot 73b in the collector ring 72 of switch 71provides a reference.

point.

After one or more complete circular sweeps and the radioactivitymeasurements are clearly plotted, the gun may be stopped relative to thereference point in a position to fire away from the adjacent tubingstring by pressure.

stopping the rotor motor solenoid 86. Motor solenoid 86 is stopped byreducing the current on wire 76 to a point below which the pulsegenerator 83 will not operate, this point, however, still being abovethe current value necessary to be sent via resistance 84a to maintainthe valve solenoid 84 actuated. With the gun so oriented, at firingcurrent is passed via Wire 78 to the gun and which fires the gun in awell-known manner. To retrieve the apparatus the current on wire 76 isthen shut ofl? so that valve solenoid 84 is deactuated and conduit 29 isnow connected to the outlet pipe 30 in the reservoir 21 so that thefluid pressure in the conduit is relieved. Spring 42 urges the piston 39towards a retracted position and pushes the fluid above back into thereservoir and the pads 19 are retracted. Thereafter, the tool isretrieved from the tubing in a well-known manner.

In the foregoing description of the apparatus and operation thereof, agamma-gamma radioactivity orienting system and a single tool wasdescribed. However, it should be obvious that if desired the source 17could be completely removed from the tool before it is lowered into thewell and instead an omnidirectional source of radioactivity lowered to acorresponding depth in the adjacent tubing string. Thus, the detector 18also can be oriented relative to the source of radioactivity in ad acenttubing string.

Referring now to FIGS. 6A and 6B, a preferable embodiment of theschematically illustrated details of the anchor section in FIG. 3 willbe described. Motor 22 is a well-known commercially available Ledexsolenoid motor assembly which produces successive longitudinal androtational. motions of a shaft upon pas-sing a current to a solenoidactuating coil (coil 85 illustrated in FIG. 4). The motor 22 is attachedto a spool-like frame 100 and a universal coupling connection 101 isused to connect the motor 22 to the shaft 102 of the pump. Shaft 102 isslidably mounted in a bearing 103 in the core of the spool and is shownin its upper operating position. Shaft 102 at its lower end has anenlarged cylindrical portion forming a valve element 104 which has ahollow or blind bore 105 therein. Valve element 104 has a lengthwiseextending, narrow width slot 106 which, in the upper position of thevalve element shown, terminates with an inclined surface 107 locatedjust above the inlet port 27 in the spool 100. Inlet port 27, like slot106 is a lengthwise extending, narrow width slot. In operation, flu-idcontained in the chamber 21 about the spool 100 is free to enter port 27and, in the position of the valve element shown, enter into the blindbore 105 of the valve element. When the motor 22 is actuated, the shaft102 is moved downwardly and rotationally so that the slot 106 of thevalve element 104 is taken out of register with the opening 27 and thefluid trapped in the blind bore 105 is therefore placed under The fluidunder pressure is forced through a spring-type check valve 108 in avalve block 109 into the pump outlet passageway 28 in the valve block.

Flow control valve 24, which is the first component of the tool to beoperated when the apparatus is in position in a well bore, has atoroidal electrical coil 84 mounted on a non-magnetic tubular supportingmember 111 and which is connected to the valve block 109, the coil beingheld on the supporting member 111 by an attachment part 112 received ina case member 113. The case member 113 with the valve block 109 providesa sealed, closed, fluid chamber enclosing therein the coil 84 andsupporting member 111. A tubular flow conduit 114 couples the lower partof the case 113 to a passageway 115 in a housing 116 which extendsdownwardly as shown in FIG. 6B to a point above the piston 39 so thatfluid can enter into the annular piston space 38'via passageway 115. Thevalve block 109 also has passageways 118, 119 which intersect at thebore forming cylinder 33 in the valve block. In the cylinder 33, thepiston 32 is urged downwardly by the spring 34.

The force of spring 34 on piston 32 can be controlled by an adjustmentnut 120, a rod 121 on the piston 32 is connected to the piston 32 andupward movement of rod 121 operates the microswitch 31. Outletpassageway 28 is centrally disposed in the valve block 109 and a lowerpassageway 123 is provided in the supporting member 111 and connects tothe discharge outlet 30 provided in the attachment member 112.

As thus far described it should be appreciated that passagewayllS, 119,the interior of case 113, conduit 114, passageway define the passageway29 referred to in FIG. 3. Passageway 35 referred to in FIG. 3, is at thejunction of passageways 118, 119 with cylinder 33 in FIG. 6A.

A valve element 123a constructed of magnetic material is slidablyreceived in the valve support 111 and has upper and lower sealingelements 126, 124. Valve element 123a is movable between the upperposition shown (where sealing element 126 closes outlet 28) and a lowerposition where sealing element 124 closes an opening in support 111 incommunication with passageway 123. When the solenoid 84 is actuated, thepassageway 123 (and outlet 30) is closed by the sealing element 124 onthe valve element and pump outlet passageway 28 opens to passageway 119in the valve block. When the solenoid 84 is de-energized, a spring 125in the valve element 123a urges the valve element 123a upwardly so thatan upper sealing element 126 closes the upper outlet passageway 28.Valve element 123a is flutted so that fluid may pass between passageway119 and the discharge passageway 123.

The entire assembly can be mounted in a tubular shell 127 in the housingso that electrical conductors can be passed between the shell and thehousing assembly.

Referring now to FIG. 6B, the parts as illustrated schematically in FIG.3 are only more accurately detailed herein and further description isnot necessary.

While particular embodiments of the present invention have been shownand described, it is apparent that changes and modifications may be madewithout departing from this invention in its broader aspects and,therefore, the aim in the appended claims is to cover all such changesand modifications as fall within the true spirit and scope of thisinvention.

What is claimed is:

1. Well perforating apparatus adapted for suspension by an electriccable in a well bore having at least one string of pipe comprising:

perforating means having a prescribed direction of lateral firing,

selectively operable anchor means for selectively engaging the wall of astring of pipe including wall engaging members movable laterally betweennon engaging and wall-engaging positions,

and hydraulic pump means operably connected to said anchor means forlaterally moving said wall-engaging members, said pump means includingsolenoid means having a longitudinally reciprocal element,

a fluid receiving cylinder, said cylinder having inlet and outlet portsand a check valve in said outlet port,

a valve element in said cylinder having an access opening therein sizedto register with said inlet port in one longitudinal position of saidvalve element in said cylinder and to be out of register with said inletport in another longitudinal position,

means connecting said valve element to said reciprocal element,

and rotator means intermediate said anchor means and said perforatingmeans operative for rotating said perforating means relative to saidanchor means when said wall engaging members are in said wall engagingposition.

2. The apparatus of claim 1 and further including:

selectively operable valve means with an inlet coupled to said outletport,

said valve means having two outlets and said valve means being operableto connect its inlet to either of its outlets,

switch means normally connected in one position to said solenoid meansfor controlling the operation of said anchor means and connected inanother position for cont-rolling the operation of said rotator means,

pressure responsive means in one of said valve means outlets operable ata prescribed pressure to operate said switch means.

3. In a well perforating and orienting apparatus adapted for suspensionby a cable in a well bore, the combination of Wall-engaging members foranchoring sections of the apparatus in the well bore and power means forrotating other sections of the apparatus in the well bore, whichcomprises piston means position-ed Within a pressure cylinder andoperably connected to said wall-engaging members, hydraulic pump meansfor supplying fluid to said piston means ,for operating saidwall-engaging members, said pump means comprising a fluid receivingcylinder having inlet and outlet ports, a check valve in said outletport, a valve element in said fluid receiving cylinder having an accessopening therein sized to register with said inlet port in onelongitudinal position of said valve element in said fluid receivingcylinder and to be out of register with said inlet port in anotherlongitudinal position, solenoid means for reciprocating said valveelement, and means providing fluid communication between said outletport and said pressure cylinder.

4. In a well perforating and orienting apparatus adapted for suspensionby a cable in a well bore, the combination of wall-engaging members foranchoring sections of the apparatus in the Well bore and power means forrotating other sections of the apparatus in the well bore, whichcomprises piston means positioned within a pressure cylinder andoperably connected to said wall-engaging members, hydraulic pump meanscomprising a fluid receiving cylinder, said cylinder having inlet andoutlet ports, a check valve in said outlet port, a valve element in saidfluid receiving cylinder having an access opening therein sized toregister with said inlet port in one longitudinal position of said valveelement in said fluid receiving cylinder and to be out of register withsaid inlet port in another longitudinal position, solenoid means forreciprocating said valve element, passageway means providing fluidcommunication between said outlet port and said pressure cylinder, meansfor selectively opening said passageway means to fluid communicationbetween said outlet port and said pressure cylinder to control theapplication of fluid to said piston means and thereby provide forselective operation of said wall-engaging members, and switch meansresponsive to pressure in said passageway means for deenergizing saidsolenoid means and for energizing said power means to rotate sections ofthe apparatus.

5. A well perforating and orienting apparatus adapted for suspension bya cable in one string of pipe in a well bore having at least one otherco-extending string of pipe comprising in combination; anchor means,rotating means, directional pipe locator means and directionalperforating means, said anchor means including a sup port, wall-engagingmembers for anchoring to the wall of a string of pipe, and means formoving said wall-engaging members relative to said support; actuatingmeans including a piston and cylinder means where one of said actuatingmeans is operably connected to said wall-engaging members and the otherof said actuating means is on said support; hydraulic pump means in saidsupport comprising a fluid receiving cylinder with inlet and outletports; a check valve in said outlet port; a valve element in said fluidreceiving cylinder having an access opening therein sized to registerwith said inlet port in one longitudinal position of said valve elementin said fluid receiving cylinder and to be out of register with saidinlet port in another longitudinal position; electrical means forreciprocating said valve element, and a passageway providing fluidcommunication between said outlet port and said actuating cylindermeans; means for selectively opening said passageway to fluidcommunication between said outlet port and said actuating cylinder meansto control the application of fluid to said actuating piston means andthereby provide for selective operation of said wall-engaging members;said rotating means being coupled between said support and said pipelocator means; switch means responsive to fluid pressure in saidpassageway for disconnecting said electrical means and for operatingsaid rotating means; said perforating means having a presecribedalignment with and coupled to said pipe locator means; rotationresponsive means for providing indications of the rotational position ofsaid perforating means and pipe locator means relative to saidwall-engaging member; and position responsive means connected to saidWall-engaging members for providing electrical signals of the positionof said wall-engaging members.

6. A well perforating and orienting apparatus adapted for suspendsion bya cable in one string of pipe in a well bore having a least one otherco-extending string of pipe comprising in combination; anchor means,rotating means, directional pipe locator means and directionalperforating means; said anchor means including a support member, pistonand cylinder operating means where one of said operating means is partof said support member; longitudinally extending wall anchor means withupper and lower ends disposed along said support member; lower linkmeans coupled to said lower end and to said support member, said lowerlink means extending downward from said lower end; upper link meanscoupled to said upper end and to the other of said operating means, saidupper link means extending upward from said upper end, said upper andlower link means permitting lateral movement of said wall anchor meansin response to actuation of said operating means; hydraulic pump meansin said support comprising a fluid receiving cylinder, with inlet andoutlet ports; a check valve in said outlet port; a valve element in saidfluid receiving cylinder having an access opening therein sized toregister with said inlet port in one longitudinal positon of said valveelement in said fluid receiving cylinder and to be out of register withsaid inlet port in another longitudinal position; electrical means forreciprocating said valve element; a passageway providing fluidcommunication between said outlet port and said cylinder operatingmeans; means for selectively opening said passageway to fluidcommunication between said outlet port and said pressure cylinder tocontrol the application of fluid to said piston operating means andthereby provide for selective operation of said wall-anchor means; saidrotating means being coupled between said support and said pipe locatormeans; switch means responsive to fluid pressure in said passageway fordisconnecting said electrical means and for operating said rotatingmeans; said perforating means having a prescribed ailgnment with andcoupled to said pipe locator means; rotation responsive means forproviding indications of the rotational position of said perforatingmeans and pipe locator means relative to said wall-anchor means; andposition responsive means connected to said wall-anchor means forproviding electrical signals of the position of said wall-anchor means.

7. Well perforating apparatus adapted for suspension by an electriccable in a well bore having at least one string of pipe thereincomprising: perforating means havinga prescribed direction of lateralfiring, selectively operable anchor means for selectively engaging thewall of a string of pipe including wall-engaging members movablelaterally between non-engaging and Wall-engaging positions, rotatormeans intermediate said anchor means and said perforating meansoperative for rotating said perforating means relative to said anchormeans when said wall-engaging members are in said wall-engagingposition, rotation responsive means connected between said perforatingand anchor means for providing electrical signals of the rotationalposition of said perforating means relative to said anchor means whensaid wall-engaging members are in said wall-engaging position, andposition responsive means connected to said wall-engaging members forproviding electrical signals of the position of said wall-engagingmembers.

8. Well perforating apparatus adapted for suspension by an electriccable in a well bore having at least one string 'of pipe thereincomprising: perforating means having a prescribed direction of lateralfiring, selectively operable anchor menas for selectively engaging thewall of a string of pipe including wall-engaging members .movablelaterally between non-engaging and wall-engaging positions, rotatormeans intermediate said anchor means and said perforating meansoperative for rotating said perforating means relative to said anchormeans when said wall-engaging members are in said wall-engagingposition, and position responsive means connected to said wall-engagingmembers for providing electrical signals of the position of saidwall-engaging members.

9. Well perforating apparatus adapted for suspension by an electriccable in one string of pipe in a well bore having at least one othercoextending string of pipe comprising: perforating means having aprescribed direction of lateral firing, pipe locator means operative fordetermining the location of one or more coextending strings of pipe fromsaid one string of pipe, said perforating means and pipe locator meansinterconnected in a prescribed oriented manner, selectively operableanchor means for selectively engaging the wall of a string of pipeincluding wall-engaging members movable laterally between non-engagingand wall-engaging positions, and rotator means intermediate said anchormeans and said interconnected perforating and pipe locator meansoperative for rotating said interconnected means relative to said anchormeans when said wall-engaging members are in said wall-engagingposition, said rotator means including electrical interconnecting meanscomprised of at least three coaxially arranged and electricallyinsulated conductors where alternate conductors are electricallygrounded.

10. Well perforating apparatus adapted for suspension by an electriccable in a well bore having at least one string of pipe comprising:perforating means having a prescribed direction of lateral firing,selectively operable anchor means for selectively engaging the wall of astring of pipe including wall-engaging members movable laterally betweennon-engaging and wall-engaging positions, said anchor means furtherincluding hydraulic actuating means connected to said wall-engagingmembers for imparting lateral movement to said members and selectivelyoperable control means for operating said hydraulic actuating means, androtator means intermediate said anchor means and said perforating meansoperative for rotating said perforating means relative to said anchormeans when said wall-engaging members are in said wall-engagingposition, said control means including switch means responsive to apredetermined fluid presprescribed oriented manner, selectively operableanchor means for selectively engaging the wall of a string of pipeincluding wall-engaging members movable laterally between non-engagingand wall-engaging positions, rotator means intermediate said anchormeans and said interconnected perforating and pipe locator meansoperative for rotating said interconnected means relative to said anchormeans when said wall-engaging members are in said wall-engagingposition, rotation responsive means for providing indications of therotational position of said perforating means relative to said anchor,and position responsive means connected to said wall-engaging membersfor providing electrical signals of the position of said wall-engagingmembers.

12. Well perforating apparatus adapted for suspension by an electriccable in a well bore having at least one string of pipe thereincomprising: perforating means; rotator means, anchor means, and pipelocator means coupled in a fixed longitudinal position relative to oneanother, said perforating means having a prescribed direction of lateralfiring, said pipe locator means and said perforating means being fixedlyinterconnected in a prescribed oriented manner, said anchor meansincluding wall-engaging members movable between non-engaging andwall-engaging positions relative to the wall of a string of pipe, saidpipe locator means being capable of locating one or more coextendingstrings of pipe from said one string of pipe; and means for selectivelymoving said wall-engaging members between said positions, said rotatormeans including a rotational connection and electrical drive means forrotating said perforating means relative to said anchor means whilemaintaining said fixed longitudinal positions between said anchor meansand perforating means.

13. Well perforating apparatus adapted for suspension by an electriccable in a well bore having at least one string of pipe thereincomprising: perforating means, rotator means, anchor means, and pipelocator means coupled in a fixed longitudinal position relative to oneanother, said perforating means having a prescribed direction of lateralfiring, said pipe locator means and said perforating means being fixedlyinterconnected in a prescribed oriented manner, said anchor meansincluding wall-engaging members movable between non-engaging andwall-engaging positions relative to the wall of a string of pipe, saidanchor means further including hydraulic actuating means connected tosaid wall-engaging members for imparting lateral movement to saidmembers; and selectively operable control means for operating saidhydraulic actuating means to move said wallengaging members between saidpositions, said rotator means including a rotational connection andelectrical drive means for rotating said perforating means relative tosaid anchor means while maintaining said fixed longitudinal positionsbetween said anchor means and perforating means.

14. Well perforating apparatus adapted for suspension by an electriccable in a well bore having at east one string of pipe thereincomprising: perforating means, rotator means, anchor means, and pipelocator means coupled in a fixed longitudinal position relative to oneanother, said perforating means having a prescribed direction of lateralfiring, said pipe locator means and said perforating means being fixedlyinterconnected in a prescribed oriented manner, said anchor meansincluding wall-engaging members movable between non-engaging andwall-engaging positions relative to the wall of a string of pipe, meansfor selectively moving said wall-engaging members between saidpositions, said rotator means including a rotational connection andelectrical drive means for rotating said perforating means relative tosaid anchor means while maintaining said fixed longitudinal positionbetween said anchor means and perforating means.

(References on following page) References Cited by the Examiner UNITEDSTATES PATENTS Corrigan 166-206 X Pieper 103-53 X Lavigne 103-53 Koch175-99 Osborn 166-554 Fleck et a1 103-154 X Dickey 103-53 May et a1 1031s4 X 10 Johns 166-63 X Weissmann et a1. 103-53 Wiseman et :11.

Krueter 103-25 Kenneday 166-55 Morse et a1 166-55 X Bessiere 103-154 XBruce et a1 166-551 Nelson 166-551 X Eames et a1. 103-25 X CHARLES E.OCONNELL, Primary Examiner. BENJAMIN HERSH, Examiner. S. J. NOVOSAD,Assistant Examiner.

8. WELL PERFORATING APPARATUS ADAPTED FOR SUSPENSION BY ELECTRIC CABLEIN A WELL BORE HAVING AT LEAST ONE STRING OF PIPE THEREIN COMPRISING:PERFORATING MEANS HAVING A PRESCRIBED DIRECTION OF LATERAL FIRING,SELECTIVELY OPERABLE ANCHOR MEANS FOR SELECTIVELY ENGAGING THE WALL OF ASTRING OF PIPE INCLUDING WALL-ENGAGING MEMBERS MOVABLE LATERALLY BETWEENNON-ENGAGING AND WALL-ENGAGING POSITIONS, RATATOR MEANS INTERMEDIATESAID ANCHOR MEANS AND SAID PERFORATING MEANS OPERATIVE FOR ROTATING SAIDPERFORATING MEANS RELATIVE TO SAID ANCHOR MEANS WHEN SAID WALL-ENGAGINGMEMBERS ARE IN SAID WALL-EN GAGING POSITION, AND POSITION RESPONSIVEMEANS CONNECTED TO SAID WALL-ENGAGING MEMBERS FOR PROVIDING ELECTRICALSIGNALS OF THE POSITION OF SAID WALL-ENGAGING MEMBERS.